[INFO] fetching crate slicestring 0.3.3...
[INFO] testing slicestring-0.3.3 against try#db823df02fd0c2cf67b43025ac3fef3f2d743245 for pr-150681
[INFO] extracting crate slicestring 0.3.3 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate slicestring 0.3.3
[INFO] finished tweaking crates.io crate slicestring 0.3.3
[INFO] tweaked toml for crates.io crate slicestring 0.3.3 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate slicestring 0.3.3 on toolchain db823df02fd0c2cf67b43025ac3fef3f2d743245
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4ee37afb865cea46c0a8979ea976809cb7ddb9f9ebf5ee379ce32edc4041b4ba
[INFO] running `Command { std: "docker" "start" "-a" "4ee37afb865cea46c0a8979ea976809cb7ddb9f9ebf5ee379ce32edc4041b4ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ee37afb865cea46c0a8979ea976809cb7ddb9f9ebf5ee379ce32edc4041b4ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ee37afb865cea46c0a8979ea976809cb7ddb9f9ebf5ee379ce32edc4041b4ba", kill_on_drop: false }`
[INFO] [stdout] 4ee37afb865cea46c0a8979ea976809cb7ddb9f9ebf5ee379ce32edc4041b4ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52d0e74961bf573bf0cff2593e363022badeeb5134e9ba55b136a6185916f3c3
[INFO] running `Command { std: "docker" "start" "-a" "52d0e74961bf573bf0cff2593e363022badeeb5134e9ba55b136a6185916f3c3", kill_on_drop: false }`
[INFO] [stderr]    Compiling slicestring v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/range.rs:12:28
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut y: usize = 0;
[INFO] [stdout]    |                            ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "52d0e74961bf573bf0cff2593e363022badeeb5134e9ba55b136a6185916f3c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52d0e74961bf573bf0cff2593e363022badeeb5134e9ba55b136a6185916f3c3", kill_on_drop: false }`
[INFO] [stdout] 52d0e74961bf573bf0cff2593e363022badeeb5134e9ba55b136a6185916f3c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1d210a403e53abf29af179327d9700dbce08adf608b8adab2430f122874b4606
[INFO] running `Command { std: "docker" "start" "-a" "1d210a403e53abf29af179327d9700dbce08adf608b8adab2430f122874b4606", kill_on_drop: false }`
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/range.rs:12:28
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut y: usize = 0;
[INFO] [stdout]    |                            ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling slicestring v0.3.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `y` is never read
[INFO] [stdout]   --> src/range.rs:12:28
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let mut y: usize = 0;
[INFO] [stdout]    |                            ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "1d210a403e53abf29af179327d9700dbce08adf608b8adab2430f122874b4606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d210a403e53abf29af179327d9700dbce08adf608b8adab2430f122874b4606", kill_on_drop: false }`
[INFO] [stdout] 1d210a403e53abf29af179327d9700dbce08adf608b8adab2430f122874b4606
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] c40e35a60257c5b4e286d2de70aecb287b578ec3acc3f04e222188a63fcb9537
[INFO] running `Command { std: "docker" "start" "-a" "c40e35a60257c5b4e286d2de70aecb287b578ec3acc3f04e222188a63fcb9537", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `y` is never read
[INFO] [stderr]   --> src/range.rs:12:28
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let mut y: usize = 0;
[INFO] [stderr]    |                            ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `slicestring` (lib) generated 1 warning
[INFO] [stderr] warning: `slicestring` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/slicestring-fe10f7c2a0438795)
[INFO] [stderr]    Doc-tests slicestring
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - str::slice (line 70) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 18) ... FAILED
[INFO] [stdout] test src/lib.rs - (line 8) ... FAILED
[INFO] [stdout] test src/lib.rs - String::slice (line 40) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - str::slice (line 70) stdout ----
[INFO] [stdout] error[E0599]: no method named `slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:72:7
[INFO] [stdout]    |
[INFO] [stdout] 72 | s = s.slice(..5);
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `split_once` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 72 - s = s.slice(..5);
[INFO] [stdout] 72 + s = s.split_once(..5);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 18) stdout ----
[INFO] [stdout] error[E0599]: no method named `slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:20:7
[INFO] [stdout]    |
[INFO] [stdout] 20 | s = s.slice(5..);
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `split_once` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 20 - s = s.slice(5..);
[INFO] [stdout] 20 + s = s.split_once(5..);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 8) stdout ----
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/lib.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | let mut s = "hello world!";
[INFO] [stdout]    |             -------------- expected due to this value
[INFO] [stdout] 13 | s = s.slice(..5);
[INFO] [stdout]    |     ^^^^^^^^^^^^ expected `&str`, found `String`
[INFO] [stdout]    |
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]    |
[INFO] [stdout] 13 | s = &s.slice(..5);
[INFO] [stdout]    |     +
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - String::slice (line 40) stdout ----
[INFO] [stdout] error[E0599]: no method named `slice` found for struct `String` in the current scope
[INFO] [stdout]   --> src/lib.rs:42:7
[INFO] [stdout]    |
[INFO] [stdout] 42 | s = s.slice(..5);
[INFO] [stdout]    |       ^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `split_once` with a similar name
[INFO] [stdout]    |
[INFO] [stdout] 42 - s = s.slice(..5);
[INFO] [stdout] 42 + s = s.split_once(..5);
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 18)
[INFO] [stdout]     src/lib.rs - (line 8)
[INFO] [stdout]     src/lib.rs - String::slice (line 40)
[INFO] [stdout]     src/lib.rs - str::slice (line 70)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.33s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "c40e35a60257c5b4e286d2de70aecb287b578ec3acc3f04e222188a63fcb9537", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c40e35a60257c5b4e286d2de70aecb287b578ec3acc3f04e222188a63fcb9537", kill_on_drop: false }`
[INFO] [stdout] c40e35a60257c5b4e286d2de70aecb287b578ec3acc3f04e222188a63fcb9537
